Method and apparatus for performing sl communication on basis of resources allocated by base station in nr v2x

ABSTRACT

Provided are a method by which a first device performs wireless communication, and an apparatus supporting same. The method may comprise the steps of: receiving, from a base station, first downlink control information (DCI) for activating a configured sidelink (SL) grant, wherein the first DCI includes information related to a physical uplink control channel (PUCCH) resource for reporting SL hybrid automatic repeat request (HARQ) feedback to the base station; transmitting a medium access control protocol data unit (MAC PDU) to a second device through a physical sidelink shared channel (PSSCH) on the basis of the configured SL grant; receiving, from the base station, second DCI for deactivating the configured SL grant; transmitting, to the base station, an SL confirmation medium access control (MAC) control element (CE) in response to the second DCI; and determining whether the PUCCH resource related to at least one SL resource allocated by the configured SL grant is valid on the basis of the time at which the SL confirmation MAC CE was transmitted.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.18/068,251, filed on Dec. 19, 2022, which is a continuation ofInternational Application No. PCT/KR2021/010187, filed on Aug. 4, 2021,which claims the benefit of U.S. Provisional Applications No.63/062,401, filed on Aug. 6, 2020 and 63/062,402 filed on Aug. 6, 2020,the contents of all of which are hereby incorporated by reference hereinin their entireties.

TECHNICAL FIELD

This disclosure relates to a wireless communication system.

BACKGROUND

Sidelink (SL) communication is a communication scheme in which a directlink is established between User Equipments (UEs) and the UEs exchangevoice and data directly with each other without intervention of anevolved Node B (eNB). SL communication is under consideration as asolution to the overhead of an eNB caused by rapidly increasing datatraffic. Vehicle-to-everything (V2X) refers to a communicationtechnology through which a vehicle exchanges information with anothervehicle, a pedestrian, an object having an infrastructure (or infra)established therein, and so on. The V2X may be divided into 4 types,such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I),vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2Xcommunication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require largercommunication capacities, the need for mobile broadband communicationthat is more enhanced than the existing Radio Access Technology (RAT) isrising. Accordingly, discussions are made on services and user equipment(UE) that are sensitive to reliability and latency. And, a nextgeneration radio access technology that is based on the enhanced mobilebroadband communication, massive Machine Type Communication (MTC),Ultra-Reliable and Low Latency Communication (URLLC), and so on, may bereferred to as a new radio access technology (RAT) or new radio (NR).Herein, the NR may also support vehicle-to-everything (V2X)communication.

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR. Theembodiment of FIG. 1 may be combined with various embodiments of thepresent disclosure.

Regarding V2X communication, a scheme of providing a safety service,based on a V2X message such as Basic Safety Message (BSM), CooperativeAwareness Message (CAM), and Decentralized Environmental NotificationMessage (DENM) is focused in the discussion on the RAT used before theNR. The V2X message may include position information, dynamicinformation, attribute information, or the like. For example, a UE maytransmit a periodic message type CAM and/or an event triggered messagetype DENM to another UE.

Thereafter, regarding V2X communication, various V2X scenarios areproposed in NR. For example, the various V2X scenarios may includevehicle platooning, advanced driving, extended sensors, remote driving,or the like.

SUMMARY

Meanwhile, a base station may configure/allocate periodic resources usedfor SL communication to a UE in the form of a configured grant (CG).Herein, for example, the base station may activate or deactivate theconfigured CG resources through DCI. Herein, if the UE receives DCI fordeactivating CG resources, a method for determining a valid PUCCHresource and a device supporting the same need to be proposed.

In one embodiment, provided is a method for performing wirelesscommunication by a first device. The method may comprise: receiving,form a base station, first downlink control information (DCI) foractivating a configured sidelink (SL) grant, wherein the first DCIincludes information related to a physical uplink control channel(PUCCH) resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station; transmitting, to a second device through aphysical sidelink shared channel (PSSCH), a medium access control (MAC)protocol data unit (PDU) based on the configured SL grant; receiving,from the base station, second DCI for deactivating the configured SLgrant; transmitting, to the base station, a SL confirmation MAC controlelement (CE) in response to the second DCI; and determining whether ornot the PUCCH resource related to at least one SL resource allocated bythe configured SL grant is valid based on a transmission time of the SLconfirmation MAC CE. Based on that the at least one SL resource islocated before the transmission time of the SL confirmation MAC CE, thePUCCH resource may be determined to be valid.

In one embodiment, provided is a first device adapted to performwireless communication. The first device may comprise: one or morememories storing instructions; one or more transceivers; and one or moreprocessors connected to the one or more memories and the one or moretransceivers. For example, the one or more processors may execute theinstructions to: receive, form a base station, first downlink controlinformation (DCI) for activating a configured sidelink (SL) grant,wherein the first DCI includes information related to a physical uplinkcontrol channel (PUCCH) resource for reporting SL hybrid automaticrepeat request (HARQ) feedback to the base station; transmit, to asecond device through a physical sidelink shared channel (PSSCH), amedium access control (MAC) protocol data unit (PDU) based on theconfigured SL grant; receive, from the base station, second DCI fordeactivating the configured SL grant; transmit, to the base station, aSL confirmation MAC control element (CE) in response to the second DCI;and determine whether or not the PUCCH resource related to at least oneSL resource allocated by the configured SL grant is valid based on atransmission time of the SL confirmation MAC CE. Based on that the atleast one SL resource is located before the transmission time of the SLconfirmation MAC CE, the PUCCH resource may be determined to be valid.

The user equipment (UE) can efficiently perform SL communication basedon resource allocation mode 1.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR,compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure.

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure.

FIG. 10 shows a procedure in which a base station allocates additionalretransmission resource(s) to a TX UE in response to HARQ NACK, based onan embodiment of the present disclosure.

FIG. 11 shows an example of a confirmation MAC CE, based on anembodiment of the present disclosure.

FIG. 12 shows a method for a UE to determine validity of an SL resourceand/or a PUCCH resource, based on an embodiment of the presentdisclosure.

FIG. 13 shows a case in which additional retransmission resource(s) isconfigured/allocated by a base station to a UE based on HARQ feedbackreporting, due to a failure of CG-based SL transmission, based on anembodiment of the present disclosure.

FIG. 14 shows a case in which additional retransmission resource(s) isconfigured/allocated by a base station to a UE based on HARQ feedbackreporting, due to a failure of DG-based SL transmission, based on anembodiment of the present disclosure.

FIG. 15 shows a method for a first device to perform wirelesscommunication, based on an embodiment of the present disclosure.

FIG. 16 shows a method for a base station to perform wirelesscommunication, based on an embodiment of the present disclosure.

FIG. 17 shows a communication system 1, based on an embodiment of thepresent disclosure.

FIG. 18 shows wireless devices, based on an embodiment of the presentdisclosure.

FIG. 19 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

FIG. 20 shows another example of a wireless device, based on anembodiment of the present disclosure.

FIG. 21 shows a hand-held device, based on an embodiment of the presentdisclosure.

FIG. 22 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure.

DETAILED DESCRIPTION

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B.” In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(PDCCH)”, it may mean that “PDCCH” is proposed as an example of the“control information”. In other words, the “control information” of thepresent specification is not limited to “PDCCH”, and “PDCCH” may beproposed as an example of the “control information”. In addition, whenindicated as “control information (i.e., PDCCH)”, it may also mean that“PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The technology described below may be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and so on. TheCDMA may be implemented with a radio technology, such as universalterrestrial radio access (UTRA) or CDMA-2000. The TDMA may beimplemented with a radio technology, such as global system for mobilecommunications (GSM)/general packet ratio service (GPRS)/enhanced datarate for GSM evolution (EDGE). The OFDMA may be implemented with a radiotechnology, such as institute of electrical and electronics engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA(E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16eand provides backward compatibility with a system based on the IEEE802.16e. The UTRA is part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTEuses the OFDMA in a downlink and uses the SC-FDMA in an uplink.LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a newClean-slate type mobile communication system having the characteristicsof high performance, low latency, high availability, and so on. 5G NRmay use resources of all spectrum available for usage including lowfrequency bands of less than 1 GHz, middle frequency bands ranging from1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more,and so on.

For clarity in the description, the following description will mostlyfocus on LTE-A or 5G NR. However, technical features according to anembodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, based on an embodiment of thepresent disclosure. The embodiment of FIG. 2 may be combined withvarious embodiments of the present disclosure.

Referring to FIG. 2 , a next generation-radio access network (NG-RAN)may include a BS 20 providing a UE 10 with a user plane and controlplane protocol termination. For example, the BS 20 may include a nextgeneration-Node B (gNB) and/or an evolved-NodeB (eNB). For example, theUE 10 may be fixed or mobile and may be referred to as other terms, suchas a mobile station (MS), a user terminal (UT), a subscriber station(SS), a mobile terminal (MT), wireless device, and so on. For example,the BS may be referred to as a fixed station which communicates with theUE 10 and may be referred to as other terms, such as a base transceiversystem (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB isincluded. The BSs 20 may be connected to one another via Xn interface.The BS 20 may be connected to one another via 5th generation (5G) corenetwork (5GC) and NG interface. More specifically, the BSs 20 may beconnected to an access and mobility management function (AMF) 30 viaNG-C interface, and may be connected to a user plane function (UPF) 30via NG-U interface.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (layer 1, L1), a second layer (layer 2,L2), and a third layer (layer 3, L3) based on the lower three layers ofthe open system interconnection (OSI) model that is well-known in thecommunication system. Among them, a physical (PHY) layer belonging tothe first layer provides an information transfer service by using aphysical channel, and a radio resource control (RRC) layer belonging tothe third layer serves to control a radio resource between the UE andthe network. For this, the RRC layer exchanges an RRC message betweenthe UE and the BS.

FIG. 3 shows a radio protocol architecture, based on an embodiment ofthe present disclosure. The embodiment of FIG. 3 may be combined withvarious embodiments of the present disclosure. Specifically, (a) of FIG.3 shows a radio protocol stack of a user plane for Uu communication, and(b) of FIG. 3 shows a radio protocol stack of a control plane for Uucommunication. (c) of FIG. 3 shows a radio protocol stack of a userplane for SL communication, and (d) of FIG. 3 shows a radio protocolstack of a control plane for SL communication.

Referring to FIG. 3 , a physical layer provides an upper layer with aninformation transfer service through a physical channel. The physicallayer is connected to a medium access control (MAC) layer which is anupper layer of the physical layer through a transport channel. Data istransferred between the MAC layer and the physical layer through thetransport channel. The transport channel is classified according to howand with what characteristics data is transmitted through a radiointerface.

Between different physical layers, i.e., a physical layer of atransmitter and a physical layer of a receiver, data are transferredthrough the physical channel. The physical channel is modulated using anorthogonal frequency division multiplexing (OFDM) scheme, and utilizestime and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer,which is a higher layer of the MAC layer, via a logical channel. The MAClayer provides a function of mapping multiple logical channels tomultiple transport channels. The MAC layer also provides a function oflogical channel multiplexing by mapping multiple logical channels to asingle transport channel. The MAC layer provides data transfer servicesover logical channels.

The RLC layer performs concatenation, segmentation, and reassembly ofRadio Link Control Service Data Unit (RLC SDU). In order to ensurediverse quality of service (QoS) required by a radio bearer (RB), theRLC layer provides three types of operation modes, i.e., a transparentmode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM).An AM RLC provides error correction through an automatic repeat request(ARQ).

A radio resource control (RRC) layer is defined only in the controlplane. The RRC layer serves to control the logical channel, thetransport channel, and the physical channel in association withconfiguration, reconfiguration and release of RBs. The RB is a logicalpath provided by the first layer (i.e., the physical layer or the PHYlayer) and the second layer (i.e., a MAC layer, an RLC layer, a packetdata convergence protocol (PDCP) layer, and a service data adaptationprotocol (SDAP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the userplane include user data delivery, header compression, and ciphering.Functions of a PDCP layer in the control plane include control-planedata delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in auser plane. The SDAP layer performs mapping between a Quality of Service(QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) markingin both DL and UL packets.

The configuration of the RB implies a process for specifying a radioprotocol layer and channel properties to provide a particular serviceand for determining respective detailed parameters and operations. TheRB can be classified into two types, i.e., a signaling RB (SRB) and adata RB (DRB). The SRB is used as a path for transmitting an RRC messagein the control plane. The DRB is used as a path for transmitting userdata in the user plane.

When an RRC connection is established between an RRC layer of the UE andan RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and,otherwise, the UE may be in an RRC_IDLE state. In case of the NR, anRRC_INACTIVE state is additionally defined, and a UE being in theRRC_INACTIVE state may maintain its connection with a core networkwhereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlinktransport channel. Examples of the downlink transport channel include abroadcast channel (BCH) for transmitting system information and adownlink-shared channel (SCH) for transmitting user traffic or controlmessages. Traffic of downlink multicast or broadcast services or thecontrol messages can be transmitted on the downlink-SCH or an additionaldownlink multicast channel (MCH). Data is transmitted from the UE to thenetwork through an uplink transport channel. Examples of the uplinktransport channel include a random access channel (RACH) fortransmitting an initial control message and an uplink SCH fortransmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of thetransport channel and mapped onto the transport channels include abroadcast channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH), a multicasttraffic channel (MTCH), etc.

FIG. 4 shows a structure of a radio frame of an NR, based on anembodiment of the present disclosure. The embodiment of FIG. 4 may becombined with various embodiments of the present disclosure.

Referring to FIG. 4 , in the NR, a radio frame may be used forperforming uplink and downlink transmission. A radio frame has a lengthof 10 ms and may be defined to be configured of two half-frames (HFs). Ahalf-frame may include five 1 ms subframes (SFs). A subframe (SF) may bedivided into one or more slots, and the number of slots within asubframe may be determined based on subcarrier spacing (SCS). Each slotmay include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In caseof using an extended CP, each slot may include 12 symbols. Herein, asymbol may include an OFDM symbol (or CP-OFDM symbol) and a SingleCarrier-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM(DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols perslot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)),and a number of slots per subframe (N^(subframe,u) _(slot)) based on anSCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot)  15 KHz (u = 0) 14  10  1  30 KHz (u = 1) 14  20 2  60 KHz (u = 2) 14  40  4 120 KHz (u = 3) 14  80  8 240 KHz (u = 4)14 160 16

Table 2 shows an example of a number of symbols per slot, a number ofslots per frame, and a number of slots per subframe based on the SCS, ina case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame,u) _(slot)N^(subframe,u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on)between multiple cells being integrate to one UE may be differentlyconfigured. Accordingly, a (absolute time) duration (or section) of atime resource (e.g., subframe, slot or TTI) (collectively referred to asa time unit (TU) for simplicity) being configured of the same number ofsymbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5Gservices may be supported. For example, in case an SCS is 15 kHz, a widearea of the conventional cellular bands may be supported, and, in casean SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrierbandwidth may be supported. In case the SCS is 60 kHz or higher, abandwidth that is greater than 24.25 GHz may be used in order toovercome phase noise.

An NR frequency band may be defined as two different types of frequencyranges. The two different types of frequency ranges may be FR1 and FR2.The values of the frequency ranges may be changed (or varied), and, forexample, the two different types of frequency ranges may be as shownbelow in Table 3. Among the frequency ranges that are used in an NRsystem, FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHZ 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR systemmay be changed (or varied). For example, as shown below in Table 4, FR1may include a band within a range of 410 MHz to 7125 MHz. Morespecifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900,5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz(or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1mat include an unlicensed band. The unlicensed band may be used fordiverse purposes, e.g., the unlicensed band for vehicle-specificcommunication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier designation frequencyrange Spacing (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

FIG. 5 shows a structure of a slot of an NR frame, based on anembodiment of the present disclosure. The embodiment of FIG. 5 may becombined with various embodiments of the present disclosure.

Referring to FIG. 5 , a slot includes a plurality of symbols in a timedomain. For example, in case of a normal CP, one slot may include 14symbols. However, in case of an extended CP, one slot may include 12symbols. Alternatively, in case of a normal CP, one slot may include 7symbols. However, in case of an extended CP, one slot may include 6symbols.

A carrier includes a plurality of subcarriers in a frequency domain. AResource Block (RB) may be defined as a plurality of consecutivesubcarriers (e.g., 12 subcarriers) in the frequency domain. A BandwidthPart (BWP) may be defined as a plurality of consecutive (Physical)Resource Blocks ((P)RBs) in the frequency domain, and the BWP maycorrespond to one numerology (e.g., SCS, CP length, and so on). Acarrier may include a maximum of N number BWPs (e.g., 5 BWPs). Datacommunication may be performed via an activated BWP. Each element may bereferred to as a Resource Element (RE) within a resource grid and onecomplex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in agiven numerology. The PRB may be selected from consecutive sub-sets ofcommon resource blocks (CRBs) for the given numerology on a givencarrier

For example, the BWP may be at least any one of an active BWP, aninitial BWP, and/or a default BWP. For example, the UE may not monitordownlink radio link quality in a DL BWP other than an active DL BWP on aprimary cell (PCell). For example, the UE may not receive PDCCH,physical downlink shared channel (PDSCH), or channel stateinformation—reference signal (CSI-RS) (excluding RRM) outside the activeDL BWP. For example, the UE may not trigger a channel state information(CSI) report for the inactive DL BWP. For example, the UE may nottransmit physical uplink control channel (PUCCH) or physical uplinkshared channel (PUSCH) outside an active UL BWP. For example, in adownlink case, the initial BWP may be given as a consecutive RB set fora remaining minimum system information (RMSI) control resource set(CORESET) (configured by physical broadcast channel (PBCH)). Forexample, in an uplink case, the initial BWP may be given by systeminformation block (SIB) for a random access procedure. For example, thedefault BWP may be configured by a higher layer. For example, an initialvalue of the default BWP may be an initial DL BWP. For energy saving, ifthe UE fails to detect downlink control information (DCI) during aspecific period, the UE may switch the active BWP of the UE to thedefault BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used intransmission and reception. For example, a transmitting UE may transmitan SL channel or an SL signal on a specific BWP, and a receiving UE mayreceive the SL channel or the SL signal on the specific BWP. In alicensed carrier, the SL BWP may be defined separately from a Uu BWP,and the SL BWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SL BWP fromthe BS/network. For example, the UE may receive a configuration for theUu BWP from the BS/network. The SL BWP may be (pre-)configured in acarrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE.For the UE in the RRC_CONNECTED mode, at least one SL BWP may beactivated in the carrier.

FIG. 6 shows an example of a BWP, based on an embodiment of the presentdisclosure. The embodiment of FIG. 6 may be combined with variousembodiments of the present disclosure. It is assumed in the embodimentof FIG. 6 that the number of BWPs is 3.

Referring to FIG. 6 , a common resource block (CRB) may be a carrierresource block numbered from one end of a carrier band to the other endthereof. In addition, the PRB may be a resource block numbered withineach BWP. A point A may indicate a common reference point for a resourceblock grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) fromthe point A, and a bandwidth N^(size) _(BWP). For example, the point Amay be an external reference point of a PRB of a carrier in which asubcarrier 0 of all numerologies (e.g., all numerologies supported by anetwork on that carrier) is aligned. For example, the offset may be aPRB interval between a lowest subcarrier and the point A in a givennumerology. For example, the bandwidth may be the number of PRBs in thegiven numerology.

Hereinafter, V2X or SL communication will be described.

A sidelink synchronization signal (SLSS) may include a primary sidelinksynchronization signal (PSSS) and a secondary sidelink synchronizationsignal (SSSS), as an SL-specific sequence. The PSSS may be referred toas a sidelink primary synchronization signal (S-PSS), and the SSSS maybe referred to as a sidelink secondary synchronization signal (S-SSS).For example, length-127 M-sequences may be used for the S-PSS, andlength-127 gold sequences may be used for the S-SSS. For example, a UEmay use the S-PSS for initial signal detection and for synchronizationacquisition. For example, the UE may use the S-PSS and the S-SSS foracquisition of detailed synchronization and for detection of asynchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast)channel for transmitting default (system) information which must befirst known by the UE before SL signal transmission/reception. Forexample, the default information may be information related to SLSS, aduplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL)configuration, information related to a resource pool, a type of anapplication related to the SLSS, a subframe offset, broadcastinformation, or the like. For example, for evaluation of PSBCHperformance, in NR V2X, a payload size of the PSBCH may be 56 bitsincluding 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format(e.g., SL synchronization signal (SS)/PSBCH block, hereinafter,sidelink-synchronization signal block (S-SSB)) supporting periodicaltransmission. The S-SSB may have the same numerology (i.e., SCS and CPlength) as a physical sidelink control channel (PSCCH)/physical sidelinkshared channel (PSSCH) in a carrier, and a transmission bandwidth mayexist within a (pre-)configured sidelink (SL) BWP. For example, theS-SSB may have a bandwidth of 11 resource blocks (RBs). For example, thePSBCH may exist across 11 RBs. In addition, a frequency position of theS-SSB may be (pre-)configured. Accordingly, the UE does not have toperform hypothesis detection at frequency to discover the S-SSB in thecarrier.

FIG. 7 shows a UE performing V2X or SL communication, based on anembodiment of the present disclosure. The embodiment of FIG. 7 may becombined with various embodiments of the present disclosure.

Referring to FIG. 7 , in V2X or SL communication, the term ‘UE’ maygenerally imply a UE of a user. However, if a network equipment such asa BS transmits/receives a signal according to a communication schemebetween UEs, the BS may also be regarded as a sort of the UE. Forexample, a UE 1 may be a first apparatus 100, and a UE 2 may be a secondapparatus 200.

For example, the UE 1 may select a resource unit corresponding to aspecific resource in a resource pool which implies a set of series ofresources. In addition, the UE 1 may transmit an SL signal by using theresource unit. For example, a resource pool in which the UE 1 is capableof transmitting a signal may be configured to the UE 2 which is areceiving UE, and the signal of the UE 1 may be detected in the resourcepool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS mayinform the UE 1 of the resource pool. Otherwise, if the UE 1 is out ofthe connectivity range of the BS, another UE may inform the UE 1 of theresource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a pluralityof resources, and each UE may select a unit of one or a plurality ofresources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 8 shows a procedure of performing V2X or SL communication by a UEbased on a transmission mode, based on an embodiment of the presentdisclosure. The embodiment of FIG. 8 may be combined with variousembodiments of the present disclosure. In various embodiments of thepresent disclosure, the transmission mode may be called a mode or aresource allocation mode. Hereinafter, for convenience of explanation,in LTE, the transmission mode may be called an LTE transmission mode. InNR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of FIG. 8 shows a UE operation related to an LTEtransmission mode 1 or an LTE transmission mode 3. Alternatively, forexample, (a) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 1. For example, the LTE transmission mode 1 may beapplied to general SL communication, and the LTE transmission mode 3 maybe applied to V2X communication.

For example, (b) of FIG. 8 shows a UE operation related to an LTEtransmission mode 2 or an LTE transmission mode 4. Alternatively, forexample, (b) of FIG. 8 shows a UE operation related to an NR resourceallocation mode 2.

Referring to (a) of FIG. 8 , in the LTE transmission mode 1, the LTEtransmission mode 3, or the NR resource allocation mode 1, a BS mayschedule an SL resource to be used by the UE for SL transmission. Forexample, the BS may perform resource scheduling to a UE 1 through aPDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g.,Configured Grant Type 1 or Configured Grant Type 2), and the UE 1 mayperform V2X or SL communication with respect to a UE 2 according to theresource scheduling. For example, the UE 1 may transmit a sidelinkcontrol information (SCI) to the UE 2 through a physical sidelinkcontrol channel (PSCCH), and thereafter transmit data based on the SCIto the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to (b) of FIG. 8 , in the LTE transmission mode 2, the LTEtransmission mode 4, or the NR resource allocation mode 2, the UE maydetermine an SL transmission resource within an SL resource configuredby a BS/network or a pre-configured SL resource. For example, theconfigured SL resource or the pre-configured SL resource may be aresource pool. For example, the UE may autonomously select or schedule aresource for SL transmission. For example, the UE may perform SLcommunication by autonomously selecting a resource within a configuredresource pool. For example, the UE may autonomously select a resourcewithin a selective window by performing a sensing and resource(re)selection procedure. For example, the sensing may be performed inunit of subchannels. In addition, the UE 1 which has autonomouslyselected the resource within the resource pool may transmit the SCI tothe UE 2 through a PSCCH, and thereafter may transmit data based on theSCI to the UE 2 through a PSSCH.

FIG. 9 shows three cast types, based on an embodiment of the presentdisclosure. The embodiment of FIG. 9 may be combined with variousembodiments of the present disclosure. Specifically, (a) of FIG. 9 showsbroadcast-type SL communication, (b) of FIG. 9 shows unicast type-SLcommunication, and (c) of FIG. 9 shows groupcast-type SL communication.In case of the unicast-type SL communication, a UE may performone-to-one communication with respect to another UE. In case of thegroupcast-type SL transmission, the UE may perform SL communication withrespect to one or more UEs in a group to which the UE belongs. Invarious embodiments of the present disclosure, SL groupcastcommunication may be replaced with SL multicast communication, SLone-to-many communication, or the like.

Hereinafter, a hybrid automatic repeat request (HARQ) procedure will bedescribed.

In case of SL unicast and groupcast, HARQ feedback and HARQ combining inthe physical layer may be supported. For example, when a receiving UEoperates in a resource allocation mode 1 or 2, the receiving UE mayreceive the PSSCH from a transmitting UE, and the receiving UE maytransmit HARQ feedback for the PSSCH to the transmitting UE by using asidelink feedback control information (SFCI) format through a physicalsidelink feedback channel (PSFCH).

For example, the SL HARQ feedback may be enabled for unicast. In thiscase, in a non-code block group (non-CBG) operation, if the receiving UEdecodes a PSCCH of which a target is the receiving UE and if thereceiving UE successfully decodes a transport block related to thePSCCH, the receiving UE may generate HARQ-ACK. In addition, thereceiving UE may transmit the HARQ-ACK to the transmitting UE.Otherwise, if the receiving UE cannot successfully decode the transportblock after decoding the PSCCH of which the target is the receiving UE,the receiving UE may generate the HARQ-NACK. In addition, the receivingUE may transmit HARQ-NACK to the transmitting UE.

For example, the SL HARQ feedback may be enabled for groupcast. Forexample, in the non-CBG operation, two HARQ feedback options may besupported for groupcast.

(1) Groupcast option 1: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of a transport block related to the PSCCH, the receiving UE maytransmit HARQ-NACK to the transmitting UE through a PSFCH. Otherwise, ifthe receiving UE decodes the PSCCH of which the target is the receivingUE and if the receiving UE successfully decodes the transport blockrelated to the PSCCH, the receiving UE may not transmit the HARQ-ACK tothe transmitting UE.

(2) Groupcast option 2: After the receiving UE decodes the PSCCH ofwhich the target is the receiving UE, if the receiving UE fails indecoding of the transport block related to the PSCCH, the receiving UEmay transmit HARQ-NACK to the transmitting UE through the PSFCH. Inaddition, if the receiving UE decodes the PSCCH of which the target isthe receiving UE and if the receiving UE successfully decodes thetransport block related to the PSCCH, the receiving UE may transmit theHARQ-ACK to the transmitting UE through the PSFCH.

For example, if the groupcast option 1 is used in the SL HARQ feedback,all UEs performing groupcast communication may share a PSFCH resource.For example, UEs belonging to the same group may transmit HARQ feedbackby using the same PSFCH resource.

For example, if the groupcast option 2 is used in the SL HARQ feedback,each UE performing groupcast communication may use a different PSFCHresource for HARQ feedback transmission. For example, UEs belonging tothe same group may transmit HARQ feedback by using different PSFCHresources.

For example, when the SL HARQ feedback is enabled for groupcast, thereceiving UE may determine whether to transmit the HARQ feedback to thetransmitting UE based on a transmission-reception (TX-RX) distanceand/or reference signal received power (RSRP).

For example, in the groupcast option 1, in case of the TX-RXdistance-based HARQ feedback, if the TX-RX distance is less than orequal to a communication range requirement, the receiving UE maytransmit HARQ feedback for the PSSCH to the transmitting UE. Otherwise,if the TX-RX distance is greater than the communication rangerequirement, the receiving UE may not transmit the HARQ feedback for thePSSCH to the transmitting UE. For example, the transmitting UE mayinform the receiving UE of a location of the transmitting UE through SCIrelated to the PSSCH. For example, the SCI related to the PSSCH may besecond SCI. For example, the receiving UE may estimate or obtain theTX-RX distance based on a location of the receiving UE and the locationof the transmitting UE. For example, the receiving UE may decode the SCIrelated to the PSSCH and thus may know the communication rangerequirement used in the PSSCH.

For example, in case of the resource allocation mode 1, a time (offset)between the PSFCH and the PSSCH may be configured or pre-configured. Incase of unicast and groupcast, if retransmission is necessary on SL,this may be indicated to a BS by an in-coverage UE which uses the PUCCH.The transmitting UE may transmit an indication to a serving BS of thetransmitting UE in a form of scheduling request (SR)/buffer statusreport (BSR), not a form of HARQ ACK/NACK. In addition, even if the BSdoes not receive the indication, the BS may schedule an SLretransmission resource to the UE. For example, in case of the resourceallocation mode 2, a time (offset) between the PSFCH and the PSSCH maybe configured or pre-configured.

For example, from a perspective of UE transmission in a carrier, TDMbetween the PSCCH/PSSCH and the PSFCH may be allowed for a PSFCH formatfor SL in a slot. For example, a sequence-based PSFCH format having asingle symbol may be supported. Herein, the single symbol may not an AGCduration. For example, the sequence-based PSFCH format may be applied tounicast and groupcast.

For example, in a slot related to a resource pool, a PSFCH resource maybe configured periodically as N slot durations, or may bepre-configured. For example, N may be configured as one or more valuesgreater than or equal to 1. For example, N may be 1, 2, or 4. Forexample, HARQ feedback for transmission in a specific resource pool maybe transmitted only through a PSFCH on the specific resource pool.

For example, if the transmitting UE transmits the PSSCH to the receivingUE across a slot #X to a slot #N, the receiving UE may transmit HARQfeedback for the PSSCH to the transmitting UE in a slot #(N+A). Forexample, the slot #(N+A) may include a PSFCH resource. Herein, forexample, A may be a smallest integer greater than or equal to K. Forexample, K may be the number of logical slots. In this case, K may bethe number of slots in a resource pool. Alternatively, for example, Kmay be the number of physical slots. In this case, K may be the numberof slots inside or outside the resource pool.

For example, if the receiving UE transmits HARQ feedback on a PSFCHresource in response to one PSSCH transmitted by the transmitting UE tothe receiving UE, the receiving UE may determine a frequency domainand/or code domain of the PSFCH resource based on an implicit mechanismin a configured resource pool. For example, the receiving UE maydetermine the frequency domain and/or code domain of the PSFCH resource,based on at least one of a slot index related to PSCCH/PSSCH/PSFCH, asub-channel related to PSCCH/PSSCH, and/or an identifier for identifyingeach receiving UE in a group for HARQ feedback based on the groupcastoption 2. Additionally/alternatively, for example, the receiving UE maydetermine the frequency domain and/or code domain of the PSFCH resource,based on at least one of SL RSRP, SINR, L1 source ID, and/or locationinformation.

For example, if HARQ feedback transmission through the PSFCH of the UEand HARQ feedback reception through the PSFCH overlap, the UE may selectany one of HARQ feedback transmission through the PSFCH and HARQfeedback reception through the PSFCH based on a priority rule. Forexample, the priority rule may be based on at least priority indicationof the related PSCCH/PSSCH.

For example, if HARQ feedback transmission of a UE through a PSFCH for aplurality of UEs overlaps, the UE may select specific HARQ feedbacktransmission based on the priority rule. For example, the priority rulemay be based on at least priority indication of the related PSCCH/PSSCH.

Hereinafter, a sidelink control information (SCI) will be described.

Control information transmitted by a BS to a UE through a PDCCH may bereferred to as downlink control information (DCI), whereas controlinformation transmitted by the UE to another UE through a PSCCH may bereferred to as SCI. For example, the UE may know in advance a startsymbol of the PSCCH and/or the number of symbols of the PSCCH, beforedecoding the PSCCH. For example, the SCI may include SL schedulinginformation. For example, the UE may transmit at least one SCI toanother UE to schedule the PSSCH. For example, one or more SCI formatsmay be defined.

For example, a transmitting UE may transmit the SCI to a receiving UE onthe PSCCH. The receiving UE may decode one SCI to receive the PSSCH fromthe transmitting UE.

For example, the transmitting UE may transmit two consecutive SCIs(e.g., 2-stage SCI) to the receiving UE on the PSCCH and/or the PSSCH.The receiving UE may decode the two consecutive SCIs (e.g., 2-stage SCI)to receive the PSSCH from the transmitting UE. For example, if SCIconfiguration fields are divided into two groups in consideration of a(relatively) high SCI payload size, an SCI including a first SCIconfiguration field group may be referred to as a first SCI or a 1stSCI, and an SCI including a second SCI configuration field group may bereferred to as a second SCI or a 2nd SCI. For example, the transmittingUE may transmit the first SCI to the receiving UE through the PSCCH. Forexample, the transmitting UE may transmit the second SCI to thereceiving UE on the PSCCH and/or the PSSCH. For example, the second SCImay be transmitted to the receiving UE through an (independent) PSCCH,or may be transmitted in a piggyback manner together with data throughthe PSSCH. For example, two consecutive SCIs may also be applied todifferent transmissions (e.g., unicast, broadcast, or groupcast).

For example, the transmitting UE may transmit the entirety or part ofinformation described below to the receiving UE through the SCI. Herein,for example, the transmitting UE may transmit the entirety or part ofthe information described below to the receiving UE through the firstSCI and/or the second SCI.

-   -   PSSCH and/or PSCCH related resource allocation information,        e.g., the number/positions of time/frequency resources, resource        reservation information (e.g., period), and/or    -   SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) report request indicator, and/or    -   SL CSI transmission indicator (or SL (L1) RSRP (and/or SL (L1)        RSRQ and/or SL (L1) RSSI) information transmission indicator))        (on PSSCH), and/or    -   MCS information, and/or    -   Transmit power information, and/or    -   L1 destination ID information and/or L1 source ID information,        and/or    -   SL HARQ process ID information, and/or    -   New data indicator (NDI) information, and/or    -   Redundancy version (RV) information, and/or    -   (Transmission traffic/packet related) QoS information, e.g.,        priority information, and/or    -   SL CSI-RS transmission indicator or information on the number of        (to-be-transmitted) SL CSI-RS antenna ports, and/or    -   Location information of a transmitting UE or location (or        distance region) information of a target receiving UE (for which        SL HARQ feedback is requested), and/or    -   Reference signal (e.g., DMRS, etc.) related to channel        estimation and/or decoding of data to be transmitted through a        PSSCH, e.g., information related to a pattern of a        (time-frequency) mapping resource of DMRS, rank information,        antenna port index information

For example, the first SCI may include information related to channelsensing. For example, the receiving UE may decode the second SCI byusing a PSSCH DMRS. A polar code used in a PDCCH may be applied to thesecond SCI. For example, in a resource pool, a payload size of the firstSCI may be identical for unicast, groupcast, and broadcast. Afterdecoding the first SCI, the receiving UE does not have to perform blinddecoding of the second SCI. For example, the first SCI may includescheduling information of the second SCI.

Meanwhile, in various embodiments of the present disclosure, since atransmitting UE may transmit at least one of a SCI, a first SCI, and/ora second SCI to a receiving UE through a PSCCH, the PSCCH may bereplaced/substituted with at least one of the SCI, the first SCI and/orthe second SCI. Additionally/alternatively, for example, the SCI may bereplaced/substituted with at least one of the PSCCH, the first SCI,and/or the second SCI. Additionally/alternatively, for example, since atransmitting UE may transmit a second SCI to a receiving UE through aPSSCH, the PSSCH may be replaced/substituted with the second SCI.

In the present disclosure, the term “configuration/configured ordefinition/defined” may be interpreted as being (pre-)configured fromthe base station or the network (through predefined signaling (e.g.,SIB, MAC signaling, RRC signaling)). For example, “A may be configured”may include “that the base station or the network(pre-)configures/defines or informs A to the UE”. Alternatively, theterm “configuration/configured or definition/defined” may be interpretedas being pre-configured or pre-defined in the system. For example, “Amay be configured” may include “that A is pre-configured/defined in thesystem”.

In the present disclosure, a packet or traffic may bereplaced/substituted with a transport block (TB) or a medium accesscontrol protocol data unit (PDU) according to a transmitted layer.

Meanwhile, in SL communication, if an RX UE (i.e., receiving UE) failsto receive or decode data transmitted by a TX UE (i.e., transmittingUE), the RX UE may request retransmission by transmitting HARQ NACK tothe TX UE. Herein, in case of SL transmission mode 1, the TX UE mayreport HARQ NACK to a base station by using a PUCCH, and the basestation may allocate additional retransmission resource(s) to the TX UEin response to the HARQ NACK.

FIG. 10 shows a procedure in which a base station allocates additionalretransmission resource(s) to a TX UE in response to HARQ NACK, based onan embodiment of the present disclosure. The embodiment of FIG. 10 maybe combined with various embodiments of the present disclosure.

Referring to FIG. 10 , in step S1000, the base station may transmit SLDCI to a first UE (i.e., TX UE). For example, the SL DCI may beconfigured grant (CG). For example, the SL DCI may be dynamic grant(DG). In step S1010, the first UE may transmit a PSCCH to a second UE(i.e., RX UE) based on the SL DCI. In step S1020, the first UE maytransmit a PSSCH related to the PSCCH to the second UE. In step S1030,the first UE may receive a PSFCH related to the PSSCH from the secondUE. For example, the first UE may receive HARQ NACK from the second UEthrough the PSFCH. In this case, the first UE may determine that SLtransmission by using the CG has failed. Accordingly, in step S1040, thefirst UE may transmit a PUCCH and/or a PUSCH to the base station inorder to be allocated (additional) retransmission resource(s) from thebase station. For example, the first UE may transmit HARQ NACK to thebase station through the PUCCH and/or the PUSCH. In step S1050, the basestation may allocate (additional) retransmission resource(s) to the UEthrough SL DCI. For example, the SL DCI may be DG.

Meanwhile, the base station may configure/allocate periodic resourcesused for SL communication to the UE through a CG format. Herein, forexample, in the case of CG type-2, the base station may activate ordeactivate configured CG resources through DCI. In this case, the basestation may configure a PUCCH resource associated with CG resource(s) tothe TX UE through the DCI for the activation. Herein, the TX UE mayreport/transmit HARQ feedback to the base station through the PUCCHresource associated with the corresponding CG resource(s), based on HARQfeedback received from the RX UE with respect to transmission using thespecific CG resource(s). In the present disclosure, for convenience ofdescription, DCI for activating CG resources may be referred to asactivation DCI, and DCI for deactivating CG resources may be referred toas release DCI.

Meanwhile, if the UE receives activation DCI or release DCI from thebase station, the UE may transmit a confirmation message to the basestation through a MAC CE in response to the activation DCI or therelease DCI. In the present disclosure, for convenience of description,a confirmation message transmitted in response to activation DCI orrelease DCI may be referred to as a confirmation MAC CE.

For example, if an operation of transmitting a confirmation MAC CE tothe base station by the UE which has received activation DCI or releaseDCI is not defined, the following problems may occur.

For example, although the base station transmits activation DCI to theUE, the UE may fail to receive or decode the activation DCI. In thiscase, if an operation of transmitting a confirmation MAC CE to the basestation by the UE which has received the activation DCI is not defined,the base station may determine that CG resources have been allocated andactivated by the activation DCI to the UE, and the base station may notallocate the CG resources to other UEs. On the other hand, the UE whichhas failed to receive or decode the activation DCI may not be able touse the CG resources allocated by the activation DCI, which may lead towastage of the resources.

For example, although the base station transmits release DCI to the UE,the UE may fail to receive or decode the release DCI. In this case, ifan operation of transmitting a confirmation MAC CE to the base stationby the UE which has received the release DCI is not defined, the basestation may determine that the UE has released and deactivated CGresources by the release DCI, and the base station may optionallyallocate the CG resources to other UEs. On the other hand, the UE whichhas failed to receive or decode the release DCI may continue to use theCG resources allocated by the release DCI, which may lead to collisionof the resources.

In order to prevent the above problem, the UE which has receiveactivation DCI or release DCI needs to transmit a confirmation MAC CE tothe base station in response to the activation DCI or the release DCI.

FIG. 11 shows an example of a confirmation MAC CE, based on anembodiment of the present disclosure. The embodiment of FIG. 11 may becombined with various embodiments of the present disclosure.

Referring to FIG. 11 , in case that there are CG type-2 resourcesrelated to index i, a Ci field (where i is a positive integer, and1≤i≤8) may represent confirmation of activation/deactivation of CG withindex i. For example, in order to confirm that CG with index i isactivated, Ci may be set to 1, and in order to confirm that CG withindex i is deactivated, Ci may be set to 0.

For example, if the base station receives a confirmation MAC CE inresponse to activation DCI related to specific CG, the base station canknow that the UE will perform SL communication based on resourcesallocated by the specific CG. For example, if the base station receivesa confirmation MAC CE in response to release DCI related to specific CG,the base station can know that the UE will apply release to resourcesallocated by the specific CG, the base station may optionally allocateresources allocated to the UE by the specific CG to other UEs.

Meanwhile, if the UE receives release DCI related to specific CG fromthe base station, and the UE transmits a confirmation MAC CE to the basestation in response to the release DCI, a reference in which the UEreleases resources (e.g., PSSCH/PSCCH resources and PUCCH resources)allocated by the specific CG needs to be clearly defined. For example,if the reference is not clearly defined, the base station may not knowwhen the UE releases resources allocated by the specific CG, and thebase station may not be able to determine when to allocate resourcesallocated by the specific CG to other UEs. If the base station allocatesresources not released by the UE to other UEs, a problem in which SLtransmissions collide between UEs may also occur.

Based on various embodiments of the present disclosure, when the basestation transmits release DCI to the UE in order to deactivate CG type-2resources previously configured, a method for transmitting/reportingHARQ feedback to the base station by the UE and device(s) supporting thesame are proposed.

For example, if the UE receives release DCI from the base station, theUE may transmit a confirmation message for the reception of the releaseDCI to the base station through a MAC CE, after a specific timeincluding a UE processing time. In this case, the UE may perform thefollowing operations for PUCCH transmission resource(s) previouslyconfigured for SL HARQ feedback reporting and SL HARQ feedbackreporting.

For example, the UE may consider/determine that all PUCCH resourcesafter the reception of the release DCI from the base station are invalidresources. In this case, after the UE receives the release DCI, the UEmay no longer perform HARQ feedback reporting to the base station byusing previously configured PUCCH resource(s).

For example, after the UE receives the release DCI from the basestation, the UE may transmit the confirmation MAC CE to the basestation. In this case, the UE may consider/determine that all PUCCHresources after the transmission time of the confirmation MAC CE to thebase station are invalid resources. For example, the UE may perform SLHARQ feedback reporting by using previously configured PUCCHresource(s), after the reception time of the release DCI and before thetransmission time of the confirmation MAC CE to the base station. Forexample, the UE may always report/transmit HARQ ACK to the base stationthrough the previously configured PUCCH resource(s) during the timeinterval (i.e., time interval between a time when the UE receives therelease DCI from the base station and a time when the UE transmits theconfirmation MAC CE to the base station). Through this, the UE canprevent the base station from configuring/allocating additionalretransmission resource(s) unnecessarily to the UE. For example, the UEmay always report/transmit HARQ NACK to the base station through thepreviously configured PUCCH resource(s) during the time interval (i.e.,time interval between a time when the UE receives the release DCI fromthe base station and a time when the UE transmits the confirmation MACCE to the base station). Through this, the UE may not transmit feedbackfor SL communication to the base station during the time interval. Forexample, the UE may consider/determine that SL transmission during thetime interval is invalid SL transmission. In this case, the UE mayexpect/determine that additional retransmission resource(s) will not beconfigured/allocated by the base station in response to HARQ NACKreported to the base station during the time interval.

For example, the UE may consider/determine that all PUCCH resourcesassociated with CG type-2 transmission resources located before thereception time of the release DCI are valid resources. For example, evenif a PUCCH resource associated with CG type-2 transmission resource(s)before a time when the UE receives the release DCI is located after thetime when the UE receives the release DCI, the UE may consider/determinethat the PUCCH resource is a valid resource. For example, the UE mayconsider/determine that all PUCCH resources associated with CG type-2transmission resources located after the reception time of the releaseDCI are invalid resources. For example, the UE may report/transmit SLHARQ feedback for SL data (e.g., PSSCH, MAC PDU, etc.) transmittedthrough the associated CG type-2 transmission resources to the basestation, through the PUCCH resource associated with the CG type-2transmission resources located before the reception time of the releaseDCI. Through this, the UE can prevent the base station fromconfiguring/allocating additional retransmission resource(s)unnecessarily to the UE. For example, the UE may always report/transmitHARQ NACK to the base station through the PUCCH resource. Through this,the UE may not transmit feedback for SL communication by using thecorresponding CG type-2 resources to the base station. For example, theUE may consider/determine that SL transmission during the time intervalis invalid SL transmission. In this case, the UE may expect/determinethat additional retransmission resource(s) will not beconfigured/allocated by the base station in response to HARQ NACKreported to the base station during the time interval.

For example, the UE may consider/determine that all PUCCH resourcesassociated with CG type-2 transmission resources located before thetransmission time of the confirmation MAC CE to the base station arevalid resources. For example, even if a PUCCH resource associated withCG type-2 transmission resource(s) before a time when the UE transmitsthe confirmation MAC CE to the base station is located after the timewhen the UE transmits the confirmation MAC CE, the UE mayconsider/determine that the PUCCH resource is a valid resource. Forexample, the UE may consider/determine that all PUCCH resourcesassociated with CG type-2 transmission resources located after thetransmission time of the confirmation MAC CE are invalid resources. Forexample, the UE may report/transmit SL HARQ feedback for SL data (e.g.,PSSCH, MAC PDU, etc.) transmitted through the associated CG type-2transmission resources to the base station, through the PUCCH resourceassociated with the CG type-2 transmission resources located before thetransmission time of the confirmation MAC CE. Through this, the UE canprevent the base station from configuring/allocating additionalretransmission resource(s) unnecessarily to the UE. For example, the UEmay always report/transmit HARQ NACK to the base station through thePUCCH resource. Through this, the UE may not transmit feedback for SLcommunication by using the corresponding CG type-2 resources to the basestation. For example, the UE may consider/determine that SL transmissionduring the time interval is invalid SL transmission. In this case, theUE may expect/determine that additional retransmission resource(s) willnot be configured/allocated by the base station in response to HARQ NACKreported to the base station during the time interval.

FIG. 12 shows a method for a UE to determine validity of an SL resourceand/or a PUCCH resource, based on an embodiment of the presentdisclosure. The embodiment of FIG. 12 may be combined with variousembodiments of the present disclosure.

Referring to FIG. 12 , the UE may receive information related to atleast one SL resource (i.e., resource for PSCCH/PSSCH) and/orinformation related to a PUCCH resource from the base station. Forexample, the resources may be allocated by CG. For example, the CG maybe CG Type-1 or CG Type-2. In the embodiment of FIG. 12 , it is assumedthat the UE transmits a confirmation MAC CE for release DCI at time T1.

In the above case, for example, at least one SL resource and a PUCCHresource included in a first group may be valid resources for the UE.For example, since the at least one SL resource and the PUCCH resourceincluded in the first group are resources located before the UEtransmits the confirmation MAC CE for release DCI, resources included inthe first group may be valid resources for the UE.

For example, at least one SL resource and a PUCCH resource included in asecond group may be valid resources for the UE. For example, althoughthe PUCCH resource included in the second group is located after the UEtransmits the confirmation MAC CE for release DCI, the UE may determinethat the PUCCH resource is valid. For example, among the at least one SLresource and the PUCCH resource included in the second group, the PUCCHresource is a resource located after the UE transmits the confirmationMAC CE for release DCI, but the at least one SL resource is resource(s)located before the UE transmits the confirmation MAC CE for release DCI.Therefore, the resources included in the second group may be validresources for the UE.

On the other hand, for example, at least one SL resource and a PUCCHresource included in a third group may be invalid resources for the UE.For example, after the UE transmits the confirmation MAC CE triggered bythe release DCI, the UE may clear the corresponding CG. For example,since the at least one SL resource and the PUCCH resource included inthe third group are resources located after the UE transmits theconfirmation MAC CE, the UE may clear the at least one SL resource andthe PUCCH resource. In this case, the base station may optionallyallocate the at least one SL resource and the PUCCH resource included inthe third group to other UEs.

In the present disclosure, when the base station transmits release DCIto the UE for SL CG type-2 transmission resources, a UE operation for SLHARQ feedback reporting using previously configured PUCCH resources andPUCCH resources has been proposed. In the proposed method, for example,the UE may consider/determine that a PUCCH resource associated withconfigured CG type-2 transmission resource(s) located before thetransmission time of the confirmation MAC CE to the base station inresponse to the reception of the release DCI is a valid resource, andthe UE may report/transmit SL HARQ feedback to the base station by usingthe PUCCH resource.

Meanwhile, in SL mode 1 transmission, the UE may perform initialtransmission and/or blind retransmission by using dynamic grant (DG) orconfigured grant (CG). In addition, if initial transmission and/or blindretransmission performed by the UE fails, the UE may report/transmitHARQ feedback (e.g., NACK information) to the base station. In addition,if the base station receives HARQ feedback (e.g., NACK information), thebase station may transmit DG (e.g., DCI) including information relatedto additional retransmission resource(s) required for HARQ-basedretransmission to the UE. In addition, the UE may perform retransmissionby using the additional retransmission resource(s). Based on variousembodiments of the present disclosure, in order for the base station toconfigure the additional retransmission resource(s) to the UE, a methodfor configuring a field value in DCI related to retransmissiontransmitted by the base station to the UE and device(s) supporting thesame are proposed.

For example, in order to configure an initial transmission resourceand/or retransmission resource(s), the base station may transmit SL DCIincluding the following fields to the UE. For example, theretransmission resource(s) may be retransmission resource(s) allocatedby DG. For example, the initial transmission resource may be an initialtransmission resource allocated by CG and/or DG.

-   -   (1) Resource pool index: index of a target resource pool to        which configured SL transmission resources are applied    -   (2) Time gap: time offset from the reception of DCI to the        initial SL transmission resource    -   (3) HARQ process number: HARQ process ID for data to be        transmitted through SL transmission resources    -   (4) New Data Indicator (NDI): indicator indicating whether new        data is transmitted    -   (5) Lowest index of the subchannel allocation to the initial        transmission    -   (6) SCI format fields: frequency resource assignment and time        resource assignment    -   (7) PSFCH-to-HARQ feedback timing indicator: time offset from a        PSFCH resource to a PUCCH resource    -   (8) PUCCH resource indicator: index for PUCCH transmission        resources configured by RRC    -   (9) Configuration index: index for CG

For example, the base station may transmit the SL DCI to the UE in orderto allocate/configure a SL initial transmission resource, SL blindretransmission resource(s), and HARQ retransmission resource(s) to theUE. In this case, as described above, if the SL DCI is DCI used by thebase station to configure/allocate additional retransmission resource(s)to the UE based on the HARQ feedback reporting received from the UE, thebase station may configure the resource pool index field as follows.Hereinafter, it will be described in detail with reference to thefigures.

FIG. 13 shows a case in which additional retransmission resource(s) isconfigured/allocated by a base station to a UE based on HARQ feedbackreporting, due to a failure of CG-based SL transmission, based on anembodiment of the present disclosure. The embodiment of FIG. 13 may becombined with various embodiments of the present disclosure.

Referring to FIG. 13 , in step S1300, the base station may transmit SLDCI to a first UE. For example, the SL DCI may be CG. In step S1310, thefirst UE may transmit a PSCCH to a second UE based on the SL DCI. Instep S1320, the first UE may transmit a PSSCH related to the PSCCH tothe second UE. In step S1330, the first UE may receive a PSFCH relatedto the PSSCH from the second UE. For example, the first UE may receiveHARQ NACK from the second UE through the PSFCH. In this case, the firstUE may determine that SL transmission by using CG has failed.Accordingly, in step S1340, the first UE may transmit a PUCCH and/or aPUSCH to the base station in order to be allocated (additional)retransmission resource(s) from the base station. For example, the firstUE may transmit HARQ NACK to the base station through the PUCCH and/orthe PUSCH. In step S1350, the base station may allocate (additional)retransmission resource(s) to the UE through SL DCI. For example, the SLDCI may be DG.

In the embodiment of FIG. 13 , if (additional) retransmissionresource(s) is configured/allocated by the base station, based on HARQfeedback reporting, to the first UE which has failed to SL transmissionby using CG, the (additional) retransmission resource(s) should be usedonly for retransmission of a TB intended to be transmitted by using theCG. For example, the first UE may obtain linkage information between theinitial transmission resource and the retransmission resource(s) byusing a configuration index included in the DCI received in step S1350.In this case, even if a plurality of SL resource pools are configuredfor the UE, a configuration index may be uniquely determined.Accordingly, at that time, a specific configuration index may beassociated with a specific SL resource pool. Therefore, in the case ofthe SL DCI (i.e., SL DCI transmitted in step S1350), the base stationmay not need to transmit a resource pool index for the (additional)retransmission resource(s). In this case, in step S1350, the basestation may transmit the SL DCI by omitting a resource pool index field.For example, in step S1350, the base station may transmit the SL DCIthat does not include a resource pool index field. By doing this, thesize of the SL DCI can be reduced. Accordingly, DCI size alignment toreduce the complexity of blind detection and channel estimation for allDL DCI and SL DCI configured for the UE can be facilitated.

For example, in step S1350, the base station may transmit a resourcepool index in the DCI for configuring/allocating the additionalretransmission resource(s) by filling it with a zero value. In thiscase, since the size of DCI for configuring/allocating initialtransmission and/or blind retransmission resources and the size of DCIfor configuring/allocating HARQ-based retransmission resources are thesame, the complexity of the UE performing blind detection to distinguishbetween the two can be removed. In addition, since the UE can know theresource pool index value in the DCI field in advance, it has anadvantage of improving decoding performance when the UE performs forwarderror correction (FEC) (e.g., polar code) decoding for DCI.

FIG. 14 shows a case in which additional retransmission resource(s) isconfigured/allocated by a base station to a UE based on HARQ feedbackreporting, due to a failure of DG-based SL transmission, based on anembodiment of the present disclosure. The embodiment of FIG. 14 may becombined with various embodiments of the present disclosure.

Referring to FIG. 14 , in step S1400, the base station may transmit SLDCI to a first UE. For example, the SL DCI may be DG. In step S1410, thefirst UE may transmit a PSCCH to a second UE based on the SL DCI. Instep S1420, the first UE may transmit a PSSCH related to the PSCCH tothe second UE. In step S1430, the first UE may receive a PSFCH relatedto the PSSCH from the second UE. For example, the first UE may receiveHARQ NACK from the second UE through the PSFCH. In this case, the firstUE may determine that SL transmission by using DG has failed.Accordingly, in step S1440, the first UE may transmit a PUCCH and/or aPUSCH to the base station in order to be allocated (additional)retransmission resource(s) from the base station. For example, the firstUE may transmit HARQ NACK to the base station through the PUCCH and/orthe PUSCH. In step S1450, the base station may allocate (additional)retransmission resource(s) to the UE through SL DCI. For example, the SLDCI may be DG.

In the embodiment of FIG. 14 , if (additional) retransmission resourcesis configured/allocated by the base station, based on HARQ feedbackreporting, to the first UE which has failed to SL transmission by usingDG, the configuration index field is an irrelevant field and cannotprovide any information. In this case, a HARQ process number in a DCIfield may provide linkage information between the initial transmissionresource and the retransmission resource(s). In this case, the UE mayexpect that the same HARQ process number is not used for one or more SLtransmissions associated with different SL resource pools at the sametime. For example, the same HARQ process number may not be used for oneor more SL transmissions associated with different SL resource pools atthe same time. As in the case of the CG above, in this case, a resourcepool index may be omitted in DCI for configuring/allocating additionalretransmission resource(s). For example, a resource pool index may notbe included in DCI for configuring/allocating additional retransmissionresource(s). Accordingly, DCI size alignment can be facilitated. Forexample, a resource pool index in DCI for configuring/allocatingadditional retransmission resource(s) may be filled with a zero value.Accordingly, complexity of blind detection for DCI may be reduced or FEDdecoding performance for DCI may be improved.

For example, a SL resource pool used for initial transmission and blindretransmission and a SL resource pool used for HARQ feedback-basedretransmission may be configured differently for the UE. For example,the base station/network may transmit information related to the SLresource pool used for initial transmission and blind retransmission andinformation related to the SL resource pool used for HARQ feedback-basedretransmission to the UE. In this case, a DCI resource pool index valuefor configuring/allocating additional retransmission resource(s) may beconfigured to be a different value from a DCI resource pool index valuefor configuring/allocating initial transmission and blind retransmissionresource(s).

In the present disclosure, a method for efficiently configuring a fieldin DCI for configuring/allocating additional retransmission resource(s)based on SL HARQ feedback is proposed. Based on the proposed method, thebase station may omit a resource pool index field in retransmission DCIor fill it with a zero value. Through this, DCI size alignment, blinddetection, and DCI FEC decoding performance can be improved.

FIG. 15 shows a method for a first device to perform wirelesscommunication, based on an embodiment of the present disclosure. Theembodiment of FIG. 15 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 15 , in step S1510, the first device may receive, forma base station, first downlink control information (DCI) for activatinga configured sidelink (SL) grant. For example, the first DCI may includeinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station. In step S1520, the first device maytransmit, to a second device through a physical sidelink shared channel(PSSCH), a medium access control (MAC) protocol data unit (PDU) based onthe configured SL grant. In step S1530, the first device may receive,from the base station, second DCI for deactivating the configured SLgrant. In step S1540, the first device may transmit, to the basestation, a SL confirmation MAC control element (CE) in response to thesecond DCI. In step S1550, the first device may determine whether or notthe PUCCH resource related to at least one SL resource allocated by theconfigured SL grant is valid based on a transmission time of the SLconfirmation MAC CE. For example, based on that the at least one SLresource is located before the transmission time of the SL confirmationMAC CE, the PUCCH resource may be determined to be valid.

For example, based on that (i) the at least one SL resource is locatedbefore the transmission time of the SL confirmation MAC CE and (ii) thePUCCH resource related to the at least one SL resource is located beforethe transmission time of the SL confirmation MAC CE, the PUCCH resourcemay be determined to be valid.

For example, based on that (i) the at least one SL resource is locatedbefore the transmission time of the SL confirmation MAC CE and (ii) thePUCCH resource related to the at least one SL resource is located afterthe transmission time of the SL confirmation MAC CE, the PUCCH resourcemay be determined to be valid. Additionally, for example, the firstdevice may transmit, to the base station, a positive acknowledgment(ACK) based on the PUCCH resource located after the transmission time ofthe SL confirmation MAC CE. For example, based on a failure to transmitthe MAC PDU, the ACK may be transmitted to the base station based on thePUCCH resource located after the transmission time of the SLconfirmation MAC CE. For example, a retransmission resource for the MACPDU may not be allocated to the first device by the base station basedon the ACK.

For example, based on that the at least one SL resource is located afterthe transmission time of the SL confirmation MAC CE, the at least one SLresource and the PUCCH resource related to the at least one SL resourcemay be determined to be invalid.

For example, the configured SL grant may be cleared after transmissionof the SL confirmation MAC CE triggered by the second DCI.

Additionally, for example, the first device may receive, from the basestation, third DCI including information related to a retransmissionresource for the MAC PDU.

For example, the third DCI may not include information related to aresource pool index. Additionally, for example, the first device maydetermine that a resource pool represented by the third DCI is same as aresource pool represented by the first DCI, based on that at least oneof a configuration index or a HARQ process number included in the thirdDCI is same as at least one of a configuration index or a HARQ processnumber included in the first DCI.

For example, a plurality of bits related to a resource pool indexincluded in the third DCI may be all set to zero.

For example, based on that information related to a resource pool indexincluded in the third DCI and information related to a resource poolindex included in the first DCI are different, at least one of a sameconfiguration index or a same HARQ process number may not be used fordifferent resource pools.

The proposed method can be applied to the device(s) based on variousembodiments of the present disclosure. First, the processor 102 of thefirst device 100 may control the transceiver 106 to receive, form a basestation, first downlink control information (DCI) for activating aconfigured sidelink (SL) grant. For example, the first DCI may includeinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station. In addition, the processor 102 of thefirst device 100 may control the transceiver 106 to transmit, to asecond device through a physical sidelink shared channel (PSSCH), amedium access control (MAC) protocol data unit (PDU) based on theconfigured SL grant. In addition, the processor 102 of the first device100 may control the transceiver 106 to receive, from the base station,second DCI for deactivating the configured SL grant. In addition, theprocessor 102 of the first device 100 may control the transceiver 106 totransmit, to the base station, a SL confirmation MAC control element(CE) in response to the second DCI. In addition, the processor 102 ofthe first device 100 may determine whether or not the PUCCH resourcerelated to at least one SL resource allocated by the configured SL grantis valid based on a transmission time of the SL confirmation MAC CE. Forexample, based on that the at least one SL resource is located beforethe transmission time of the SL confirmation MAC CE, the PUCCH resourcemay be determined to be valid.

Based on an embodiment of the present disclosure, a first device adaptedto perform wireless communication may be provided. For example, thefirst device may comprise: one or more memories storing instructions;one or more transceivers; and one or more processors connected to theone or more memories and the one or more transceivers. For example, theone or more processors may execute the instructions to: receive, form abase station, first downlink control information (DCI) for activating aconfigured sidelink (SL) grant, wherein the first DCI includesinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station; transmit, to a second device through aphysical sidelink shared channel (PSSCH), a medium access control (MAC)protocol data unit (PDU) based on the configured SL grant; receive, fromthe base station, second DCI for deactivating the configured SL grant;transmit, to the base station, a SL confirmation MAC control element(CE) in response to the second DCI; and determine whether or not thePUCCH resource related to at least one SL resource allocated by theconfigured SL grant is valid based on a transmission time of the SLconfirmation MAC CE. For example, based on that the at least one SLresource is located before the transmission time of the SL confirmationMAC CE, the PUCCH resource may be determined to be valid.

Based on an embodiment of the present disclosure, an apparatus adaptedto control a first user equipment (UE) may be provided. For example, theapparatus may comprise: one or more processors; and one or more memoriesoperably connected to the one or more processors and storinginstructions. For example, the one or more processors may execute theinstructions to: receive, form a base station, first downlink controlinformation (DCI) for activating a configured sidelink (SL) grant,wherein the first DCI includes information related to a physical uplinkcontrol channel (PUCCH) resource for reporting SL hybrid automaticrepeat request (HARQ) feedback to the base station; transmit, to asecond UE through a physical sidelink shared channel (PSSCH), a mediumaccess control (MAC) protocol data unit (PDU) based on the configured SLgrant; receive, from the base station, second DCI for deactivating theconfigured SL grant; transmit, to the base station, a SL confirmationMAC control element (CE) in response to the second DCI; and determinewhether or not the PUCCH resource related to at least one SL resourceallocated by the configured SL grant is valid based on a transmissiontime of the SL confirmation MAC CE. For example, based on that the atleast one SL resource is located before the transmission time of the SLconfirmation MAC CE, the PUCCH resource may be determined to be valid.

Based on an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, may cause a first deviceto: receive, form a base station, first downlink control information(DCI) for activating a configured sidelink (SL) grant, wherein the firstDCI includes information related to a physical uplink control channel(PUCCH) resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station; transmit, to a second device through aphysical sidelink shared channel (PSSCH), a medium access control (MAC)protocol data unit (PDU) based on the configured SL grant; receive, fromthe base station, second DCI for deactivating the configured SL grant;transmit, to the base station, a SL confirmation MAC control element(CE) in response to the second DCI; and determine whether or not thePUCCH resource related to at least one SL resource allocated by theconfigured SL grant is valid based on a transmission time of the SLconfirmation MAC CE. For example, based on that the at least one SLresource is located before the transmission time of the SL confirmationMAC CE, the PUCCH resource may be determined to be valid.

FIG. 16 shows a method for a base station to perform wirelesscommunication, based on an embodiment of the present disclosure. Theembodiment of FIG. 16 may be combined with various embodiments of thepresent disclosure.

Referring to FIG. 16 , in step S1610, the base station may transmit, toa first device, first downlink control information (DCI) for activatinga configured sidelink (SL) grant. For example, the first DCI may includeinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station. In step S1620, the base station maytransmit, to the first device, second DCI for deactivating theconfigured SL grant. In step S1630, the base station may receive, fromthe first device, a SL confirmation medium access control (MAC) controlelement (CE) in response to the second DCI. For example, based on thatat least one SL resource allocated by the configured SL grant is locatedbefore a transmission time of the SL confirmation MAC CE by the firstdevice, the PUCCH resource related to the at least one SL resource maybe valid.

The proposed method can be applied to device(s) based on variousembodiments of the present disclosure. First, the processor 202 of thebase station 200 may control the transceiver 206 to transmit, to a firstdevice, first downlink control information (DCI) for activating aconfigured sidelink (SL) grant. For example, the first DCI may includeinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station. In addition, the processor 202 of the basestation 200 may control the transceiver 206 to transmit, to the firstdevice, second DCI for deactivating the configured SL grant. Inaddition, the processor 202 of the base station 200 may control thetransceiver 206 to receive, from the first device, a SL confirmationmedium access control (MAC) control element (CE) in response to thesecond DCI. For example, based on that at least one SL resourceallocated by the configured SL grant is located before a transmissiontime of the SL confirmation MAC CE by the first device, the PUCCHresource related to the at least one SL resource may be valid.

Based on an embodiment of the present disclosure, a base station adaptedto perform wireless communication may be provided. For example, the basestation may comprise: one or more memories storing instructions; one ormore transceivers; and one or more processors connected to the one ormore memories and the one or more transceivers. For example, the one ormore processors may execute the instructions to: transmit, to a firstdevice, first downlink control information (DCI) for activating aconfigured sidelink (SL) grant, wherein the first DCI includesinformation related to a physical uplink control channel (PUCCH)resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station; transmit, to the first device, second DCIfor deactivating the configured SL grant; and receive, from the firstdevice, a SL confirmation medium access control (MAC) control element(CE) in response to the second DCI. For example, based on that at leastone SL resource allocated by the configured SL grant is located before atransmission time of the SL confirmation MAC CE by the first device, thePUCCH resource related to the at least one SL resource may be valid.

Based on an embodiment of the present disclosure, an apparatus adaptedto control a base station may be provided. For example, the apparatusmay comprise: one or more processors; and one or more memories operablyconnected to the one or more processors and storing instructions. Forexample, the one or more processors may execute the instructions to:transmit, to a first user equipment (UE), first downlink controlinformation (DCI) for activating a configured sidelink (SL) grant,wherein the first DCI includes information related to a physical uplinkcontrol channel (PUCCH) resource for reporting SL hybrid automaticrepeat request (HARQ) feedback to the base station; transmit, to thefirst UE, second DCI for deactivating the configured SL grant; andreceive, from the first UE, a SL confirmation medium access control(MAC) control element (CE) in response to the second DCI. For example,based on that at least one SL resource allocated by the configured SLgrant is located before a transmission time of the SL confirmation MACCE by the first UE, the PUCCH resource related to the at least one SLresource may be valid.

Based on an embodiment of the present disclosure, a non-transitorycomputer-readable storage medium storing instructions may be provided.For example, the instructions, when executed, may cause a base stationto: transmit, to a first device, first downlink control information(DCI) for activating a configured sidelink (SL) grant, wherein the firstDCI includes information related to a physical uplink control channel(PUCCH) resource for reporting SL hybrid automatic repeat request (HARQ)feedback to the base station; transmit, to the first device, second DCIfor deactivating the configured SL grant; and receive, from the firstdevice, a SL confirmation medium access control (MAC) control element(CE) in response to the second DCI. For example, based on that at leastone SL resource allocated by the configured SL grant is located before atransmission time of the SL confirmation MAC CE by the first device, thePUCCH resource related to the at least one SL resource may be valid.

Based on various embodiments of the present disclosure, if the UEreceives release DCI for CG resources, a method for determining a validPUCCH resource by the UE can be clearly defined. Further, in SL mode 1operation, signaling overhead related to DCI for allocatingretransmission resource(s) can be minimized.

Various embodiments of the present disclosure may be combined with eachother.

Hereinafter, device(s) to which various embodiments of the presentdisclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 17 shows a communication system 1, based on an embodiment of thepresent disclosure.

Referring to FIG. 17 , a communication system 1 to which variousembodiments of the present disclosure are applied includes wirelessdevices, Base Stations (BSs), and a network. Herein, the wirelessdevices represent devices performing communication using Radio AccessTechnology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE))and may be referred to as communication/radio/5G devices. The wirelessdevices may include, without being limited to, a robot 100 a, vehicles100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-helddevice 100 d, a home appliance 100 e, an Internet of Things (IoT) device100 f, and an Artificial Intelligence (AI) device/server 400. Forexample, the vehicles may include a vehicle having a wirelesscommunication function, an autonomous vehicle, and a vehicle capable ofperforming communication between vehicles. Herein, the vehicles mayinclude an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR devicemay include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented in the form of a Head-Mounted Device(HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, asmartphone, a computer, a wearable device, a home appliance device, adigital signage, a vehicle, a robot, etc. The hand-held device mayinclude a smartphone, a smartpad, a wearable device (e.g., a smartwatchor a smartglasses), and a computer (e.g., a notebook). The homeappliance may include a TV, a refrigerator, and a washing machine. TheIoT device may include a sensor and a smartmeter. For example, the BSsand the network may be implemented as wireless devices and a specificwireless device 200 a may operate as a BS/network node with respect toother wireless devices.

Here, wireless communication technology implemented in wireless devices100 a to 100 f of the present disclosure may include Narrowband Internetof Things for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 a to100 f of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called by various names includingenhanced Machine Type Communication (eMTC), and the like. For example,the LTE-M technology may be implemented as at least any one of variousstandards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTEnon-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine TypeCommunication, and/or 7) LTE M, and is not limited to the name describedabove. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 a to 100 f of thepresent disclosure may include at least one of Bluetooth, Low Power WideArea Network (LPWAN), and ZigBee considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)related to small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be called byvarious names.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

FIG. 18 shows wireless devices, based on an embodiment of the presentdisclosure.

Referring to FIG. 18 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 17 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

FIG. 19 shows a signal process circuit for a transmission signal, basedon an embodiment of the present disclosure.

Referring to FIG. 19 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 19 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 18 . Hardwareelements of FIG. 19 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 18 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 18. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 18 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 18 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 19 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 19 . For example, the wireless devices(e.g., 100 and 200 of FIG. 18 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

FIG. 20 shows another example of a wireless device, based on anembodiment of the present disclosure. The wireless device may beimplemented in various forms according to a use-case/service (refer toFIG. 17 ).

Referring to FIG. 20 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 18 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 18 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 18 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 17 ), the vehicles (100 b-1 and 100 b-2 of FIG. 17 ), the XRdevice (100 c of FIG. 17 ), the hand-held device (100 d of FIG. 17 ),the home appliance (100 e of FIG. 17 ), the IoT device (100 f of FIG. 17), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 17 ), the BSs (200 of FIG. 17 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 20 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 20 will be described indetail with reference to the drawings.

FIG. 21 shows a hand-held device, based on an embodiment of the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 21 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to 140 c correspond tothe blocks 110 to 130/140 of FIG. 20 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

FIG. 22 shows a vehicle or an autonomous vehicle, based on an embodimentof the present disclosure. The vehicle or autonomous vehicle may beimplemented by a mobile robot, a car, a train, a manned/unmanned AerialVehicle (AV), a ship, etc.

Referring to FIG. 22 , a vehicle or autonomous vehicle 100 may includean antenna unit 108, a communication unit 110, a control unit 120, adriving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, andan autonomous driving unit 140 d. The antenna unit 108 may be configuredas a part of the communication unit 110. The blocks 110/130/140 a to 140d correspond to the blocks 110/130/140 of FIG. 20 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous vehicle 100. The control unit 120 may includean Electronic Control Unit (ECU). The driving unit 140 a may cause thevehicle or the autonomous vehicle 100 to drive on a road. The drivingunit 140 a may include an engine, a motor, a powertrain, a wheel, abrake, a steering device, etc. The power supply unit 140 b may supplypower to the vehicle or the autonomous vehicle 100 and include awired/wireless charging circuit, a battery, etc. The sensor unit 140 cmay acquire a vehicle state, ambient environment information, userinformation, etc. The sensor unit 140 c may include an InertialMeasurement Unit (IMU) sensor, a collision sensor, a wheel sensor, aspeed sensor, a slope sensor, a weight sensor, a heading sensor, aposition module, a vehicle forward/backward sensor, a battery sensor, afuel sensor, a tire sensor, a steering sensor, a temperature sensor, ahumidity sensor, an ultrasonic sensor, an illumination sensor, a pedalposition sensor, etc. The autonomous driving unit 140 d may implementtechnology for maintaining a lane on which a vehicle is driving,technology for automatically adjusting speed, such as adaptive cruisecontrol, technology for autonomously driving along a determined path,technology for driving by automatically setting a path if a destinationis set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous vehicle 100 may movealong the autonomous driving path according to the driving plan (e.g.,speed/direction control). In the middle of autonomous driving, thecommunication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous vehicles and provide the predicted traffic information datato the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. Forinstance, technical features in method claims of the present descriptioncan be combined to be implemented or performed in an apparatus, andtechnical features in apparatus claims can be combined to be implementedor performed in a method. Further, technical features in method claim(s)and apparatus claim(s) can be combined to be implemented or performed inan apparatus. Further, technical features in method claim(s) andapparatus claim(s) can be combined to be implemented or performed in amethod.

What is claimed is:
 1. A method for performing wireless communication bya first device, the method comprising: receiving, form a base station,downlink control information (DCI) for activating a configured sidelinkgrant, the DCI including information related to a physical uplinkcontrol channel (PUCCH) resource to report hybrid automatic repeatrequest-acknowledgement (HARQ-ACK) information; initializing theconfigured sidelink grant to determine a set of physical sidelinkcontrol channel (PSCCH) durations and a set of physical sidelink sharedchannel (PSSCH) durations for medium access control (MAC) protocol dataunit (PDU) transmission; receiving, from the base station, DCI fordeactivating the configured sidelink grant; transmitting, to the basestation, a sidelink configured grant confirmation MAC control element(CE); and clearing the configured sidelink grant after the transmissionof the sidelink configured grant confirmation MAC CE triggered by theDCI for deactivating the configured sidelink grant.
 2. The method ofclaim 1, wherein, based on that at least one sidelink resource allocatedby the configured sidelink grant is located before the transmission ofthe sidelink configured grant confirmation MAC CE, the PUCCH resourcerelated to the at least one sidelink resource is valid.
 3. The method ofclaim 1, wherein, based on that (i) at least one sidelink resourceallocated by the configured sidelink grant is located before thetransmission of the sidelink configured grant confirmation MAC CE and(ii) the PUCCH resource related to the at least one sidelink resource islocated before the transmission of the sidelink configured grantconfirmation MAC CE, the PUCCH resource related to the at least onesidelink resource is valid.
 4. The method of claim 1, wherein the firstdevice clears the configured sidelink grant immediately after thetransmission of the sidelink configured grant confirmation MAC CEtriggered by the DCI for deactivating the configured sidelink grant. 5.The method of claim 1, wherein the configured sidelink grant is providedby a physical downlink control channel (PDCCH), and stored or cleared asconfigured sidelink grant based on L1 signalling indicating configuredsidelink grant activation or deactivation.
 6. The method of claim 1,wherein, based on that (i) at least one sidelink resource allocated bythe configured sidelink grant is located before the transmission of thesidelink configured grant confirmation MAC CE and (ii) the PUCCHresource related to the at least one sidelink resource is located afterthe transmission of the sidelink configured grant confirmation MAC CE,the PUCCH resource related to the at least one sidelink resource isvalid.
 7. The method of claim 1, further comprising: transmitting, tothe base station, a positive acknowledgment based on the PUCCH resourcelocated after the transmission of the sidelink configured grantconfirmation MAC CE.
 8. The method of claim 7, wherein, based on afailure of the MAC PDU transmission, the positive acknowledgment istransmitted to the base station based on the PUCCH resource locatedafter the transmission of the sidelink configured grant confirmation MACCE.
 9. The method of claim 7, wherein a retransmission resource for theMAC PDU transmission is not allocated to the first device by the basestation based on the positive acknowledgment.
 10. The method of claim 1,wherein the MAC PDU transmission includes transmissions of multiple MACPDUs.
 11. A first device adapted to perform wireless communication, thefirst device comprising: at least one transceiver; at least oneprocessor; and at least one memory connected to the at least oneprocessor and storing instructions that, based on being executed, causethe first device to perform operations comprising: receiving, form abase station, downlink control information (DCI) for activating aconfigured sidelink grant, the DCI including information related to aphysical uplink control channel (PUCCH) resource to report hybridautomatic repeat request-acknowledgement (HARQ-ACK) information;initializing the configured sidelink grant to determine a set ofphysical sidelink control channel (PSCCH) durations and a set ofphysical sidelink shared channel (PSSCH) durations for medium accesscontrol (MAC) protocol data unit (PDU) transmission; receiving, from thebase station, DCI for deactivating the configured sidelink grant;transmitting, to the base station, a sidelink configured grantconfirmation MAC control element (CE); and clearing the configuredsidelink grant after the transmission of the sidelink configured grantconfirmation MAC CE triggered by the DCI for deactivating the configuredsidelink grant.
 12. The first device of claim 11, wherein, based on thatat least one sidelink resource allocated by the configured sidelinkgrant is located before the transmission of the sidelink configuredgrant confirmation MAC CE, the PUCCH resource related to the at leastone sidelink resource is valid.
 13. The first device of claim 11,wherein, based on that (i) at least one sidelink resource allocated bythe configured sidelink grant is located before the transmission of thesidelink configured grant confirmation MAC CE and (ii) the PUCCHresource related to the at least one sidelink resource is located beforethe transmission of the sidelink configured grant confirmation MAC CE,the PUCCH resource related to the at least one sidelink resource isvalid.
 14. The first device of claim 11, wherein the first device clearsthe configured sidelink grant immediately after the transmission of thesidelink configured grant confirmation MAC CE triggered by the DCI fordeactivating the configured sidelink grant.
 15. The first device ofclaim 11, wherein the configured sidelink grant is provided by aphysical downlink control channel (PDCCH), and stored or cleared asconfigured sidelink grant based on L1 signalling indicating configuredsidelink grant activation or deactivation.
 16. A processing deviceadapted to control a first device, the processing device comprising: atleast one processor; and at least one memory connected to the at leastone processor and storing instructions that, based on being executed,cause the first device to perform operations comprising: receiving, forma base station, downlink control information (DCI) for activating aconfigured sidelink grant, the DCI including information related to aphysical uplink control channel (PUCCH) resource to report hybridautomatic repeat request-acknowledgement (HARQ-ACK) information;initializing the configured sidelink grant to determine a set ofphysical sidelink control channel (PSCCH) durations and a set ofphysical sidelink shared channel (PSSCH) durations for medium accesscontrol (MAC) protocol data unit (PDU) transmission; receiving, from thebase station, DCI for deactivating the configured sidelink grant;transmitting, to the base station, a sidelink configured grantconfirmation MAC control element (CE); and clearing the configuredsidelink grant after the transmission of the sidelink configured grantconfirmation MAC CE triggered by the DCI for deactivating the configuredsidelink grant.
 17. The processing device of claim 16, wherein, based onthat at least one sidelink resource allocated by the configured sidelinkgrant is located before the transmission of the sidelink configuredgrant confirmation MAC CE, the PUCCH resource related to the at leastone sidelink resource is valid.
 18. The processing device of claim 16,wherein, based on that (i) at least one sidelink resource allocated bythe configured sidelink grant is located before the transmission of thesidelink configured grant confirmation MAC CE and (ii) the PUCCHresource related to the at least one sidelink resource is located beforethe transmission of the sidelink configured grant confirmation MAC CE,the PUCCH resource related to the at least one sidelink resource isvalid.
 19. The processing device of claim 16, wherein the first deviceclears the configured sidelink grant immediately after the transmissionof the sidelink configured grant confirmation MAC CE triggered by theDCI for deactivating the configured sidelink grant.
 20. The processingdevice of claim 16, wherein the configured sidelink grant is provided bya physical downlink control channel (PDCCH), and stored or cleared asconfigured sidelink grant based on L1 signalling indicating configuredsidelink grant activation or deactivation.